Journal
NANO ENERGY
Volume 26, Issue -, Pages 371-381Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.nanoen.2016.05.037
Keywords
Hot electrons; Internal photoemission; Sub-bandgap photovoltaics; Photodetection; Plasmonics; Metamaterials
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Hot-electron devices are emerging as promising candidates for the transduction of optical radiation into electrical current, as they enable photodetection and solar/infrared energy harvesting at sub-bandgap wavelengths. Nevertheless, poor photoconversion quantum yields and low bandwidth pose fundamental challenges to fascinating applications of hot-electron optoelectronics. Based on a novel hyperbolic metamaterial (HMM) structure, we theoretically propose a vertically-integrated hot-electron device that can efficiently couple plasmonic excitations into electron flows, with an external quantum efficiency approaching the physical limit. Further, this metamaterial-based device can have a broadband and omnidirectional response at infrared and visible wavelengths. We believe that these findings may shed some light on designing practical devices for energy-efficient photodetection and energy harvesting beyond the bandgap spectral limit. (C) 2016 Elsevier Ltd. All rights reserved.
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